One of the four underlined parts marked A, B, C, D in each sentence is not correct in standard English. Identify them: 

If I had known he is not at home, I wouldn’t have gone all the way to his house. 

The columnist feels sure that who wins the election will have the support of both parties

If the water level has raised a little higher, the dam would probably have broken

I’m trying to save up for a trip to Canada, so I can’t afford buying much at the moment.

Since the computer was invented, the work of accountants have been simplified.

After the police had tried unsuccessfully to determine to who the car belonged, they towed it into the station.

The basic elements of public-opinion research are interviewers, questionnaires, tabulating equipment, and to sample population

Without any hesitation, he did a decision not to take the course

Colleges in the newly formed United States, in recovering from the adverse effects of the American Revolution, inaugurated a broad curriculum in response of social demands.

Jessamyn West’s first and most famous novel, the friendly persuasion, describes the life of the Quaker farmed family in the mid-1800’s.

The parcel which my uncle sent me from America containing two books and some tapes.

The number of teaching assistants required meeting undergraduate course needs is rapidly increasing.

Our civilization is so commonplace to us that rarely we stop to think about its complexity

Some of plants in this store require very little care, but this one needs much more sunlight than those 

Many birds will, in the normal course of their migrations, flying more than three thousand miles to reach their winter homes.

Every year, thousands of tourists visit ……... Nile River.

I work in a large office with about thirty other people, most of whom I know quite well enough.

Interest in automatic data Processing has grown rapid since the first large calculators were introduced in 1950.

Because the diamond is the hardest naturally occurring substance, it is used in industry for to cut, grinding, and boring other hard materials.

................... blue is .................. color I like. 

Choose the correct answer to complete the sentence. "We must _____ that people are heavily polluting the environment."